Chapter 30 - IVUS

Question 1

Two types of IVUS image acquisition

Answer 1

Mechanically - boston scientific

Electronically - volcano

Question 2

Mechanical system of IVUS

Answer 2

Flexible high-torque catheter with quick rotating ultrasound transducer at tip

Question 3

Electonic system of IVUS

Answer 3

64 miniaturized transducer around tip of catheter

activated in sequence to produce images

Question 4

Frequency of IVUS for coronary, peripheral and trunk vessels

Answer 4

Coronary 45 MHz
Large peripheral 20 MHz
Aorta, IVC, iliac 10 MHz

Question 5

Images on IVUS interpreted

Answer 5

Calcified plaque = echogenic + posterior shadowing
Fibrotic plaque = less bright without posterior shadowing
Lipid-plaque = echolucent, dark

Question 6

Intraoperative imaging modalities

Answer 6

1) IVUS
2) IV MRI
3) optical coherence tomography
4) TEE
5) near infrared spectroscopy
6) angiography
7) fractional flow reserve

Question 7

Major complication rate of IVUS

Answer 7

0.5%